That's a piece of it. I used to have a massive collection of Scientific American and Discover magazines with articles on the process of vision. It is a truly messy and individual thing once you get past the physics outside and into the neurological inside. BTW, got girlfriend, lost storage room, something had to go and I'm NOT that geeky... (grin)!

Pass no temptation lightly by, for one never knows when it may pass again!